Thermo-electric apparatus.



No. 764,178. 7 PATENTED JULY 5, 1904 W. H. BRISTOL. THERMO ELECTRIC APPARATUS.

APPLIUATION FILED MAY 6, 1904.

R0 MODEL.

WITNESSES. N VENTOI?" ATTORNEY,

Patented July 5, 1904.

WILLIAM H. BRISTOL, OF HOBOKEN, NEW JERSEY.

THERMO-ELECTRIC APPARATUS.

SPECIFICATION forming part of Letters Patent No. 764,178, dated J uly 5, 1904. Applicatidn filed May 5,1904. Serial No. 206,478. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM H. BRISTOL, a citizen of the United States of America, residing at Hoboken, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Thermo- Electric Apparatus, of which the following is a specification.

My invention has reference to thermo-electric apparatus, particularly adapted for use in the arts for indicating, in connection with a suitable electric measuring instrument, the temperature of the article to be heated or otherwise treated in a bathfor instance, in the tempering of tools, in tinning, galvaniz ing, or otherwise coating or covering a sheet of metal.

My invention relates particularly to thermic couples wherein the two elements are separated from each other instead of being joined at the hot end, which construction is fully described in my prior application for Letters Patent, Serial No. 201,580, filed April 4, 1904.

My invention consists, essentially, in athermo-electric apparatus comprising two separate elements, one of which is constituted in whole or part by the article to be heated or otherwise treated, an electrical measuring instrument in connection with the couple, and a bath connecting the opposite ends of the couple. I

The nature of my invention will best be understood when described in connection with the accompanying drawings, in which- Figure 1 represents an elevation, partly in section, showing diagrammatically one form of thermo-electrical apparatus embodying my invention. Fig. 2 is a similar view with the measuring instrument omitted, illustrating a modified form. Fig. 3 shows a form wherein the elements are held together. Fig. 4 is a sectional perspective view showing the apparatus employed in tinning or coating.

Similar letters and numerals of reference designate corresponding parts throughout the several views of the drawings.

Referring to Fig. 1 of the drawings, the letter A designates one of the elements adapted to form the thermo-electric couple, and B is the second element, which in this case is wholly or partly formed by the article to be heated to a certain temperature or otherwise treated in the bath.

C is a receptacle which may be in the form of a pot or crucible and which is heated in a usual manner.

D is the electric measuring instrument, which may be in the form of an indicating or recording instrument -such, for instance, as a voltmeter of any suitable construction, to the binding-posts of which the elements are connected by wires 10 11, respectively. The element B is held in a usual manner as, for instance, by a pair of tongs 7) of a form adapted to hold the article to be treated and made of the same material as the article, so as to avoid the formation of auxiliary couples. These tongs are connected by wire 11 with the measuring instrument. In the present instance I have shown the pyrometer so formed used to indicate the temperature of drills when placed in the tempering-bath, the bath forming the electrical connection between the drill and the other element at the hot ends. It is evident that by this means the exact temperature of the drill is indicated by the measuring-instrument, and it can be removed when it has reached the temperature desired. Heretofore when pyrometers were used for giving the temperatures only the temperature of the bath was ascertained and not that of the article itself.

Instead of using a separate inserted element,

. as A, the receptacle 0 can be used to form one of the elements of the couple provided a portion, as A, of the same is extended sufficiently to form a cold end or a bar of the same material as the vesselis attachedthereto. This construction I have shown in Fig. 2, and have also shown a chuck I) used to hold the article and to make the electric connection with the instrument through wire 11.

To save wear on the element A, it can be connected to the other element B, as shown in Fig. 3, by means, for instance, of a clamp 1: of non-conducting material, thus causing it to be removed with the article.

As shown in Fig. 4, the same principle can be used in connection with tanks, pots, or other fee receptacles for tinning, galvanizing, or coat ing metakor other-sheets or strips, Sac. arrangement is in general the sameas before,

The

2. thermo-electric apparatus comprising; two separate elements, one of which 1S constituted in whole or part by the article to be being the cast-iron tank, A one element,

and B the other element formed by the plate to he treated, and 1') the tongs constructed to properlyhold the plates. \Vhen with continued or repeated use the end or part of the element A exposed to high temperature becomes treated, and the other byareceptacle, an electrical measuring instrument in connection with one end of the couple and a bathconnecting the opposite end of the couple.

3. A thermo-electric apparatus comprising" two separate elements, one of WlllClllS'COflStlbrittle, it is burned or coated sufficiently to 1 cause. an appreciable error in the reading of the instrument. The part afi'ected can he readily removed by grinding or otherwise, so as to present new surfaces to the bath. The element A is made of a metal different from that of the article to be ,treated.

\Vhat I claim new is--- 1. A thermo-electric apparatus comprising twoseparate elements, one of which is constituted in whole or part by the article to be treated, an electrical measuring instrument in;

connection with one end of the couple and a bath connecting the opposite end of the couple.

tnted in part by the article to be treated, a non-conducting connection between the two elements, an electrical measuring instrument in connection with one end of the couple and a bath cormecting the opposite end of the couple. 7 r

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

WILLIAM H. BRISTOL.

'itnesses:

= A. FMHGR on Faun, .Ir.,

RAENA II. Ymnzin'. 

